Will a mixture of hydrochloric acid and dichloropropanol with a concentration of 20% or less corrode 304 stainless steel?
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Will a mixture of hydrochloric acid and dichloropropanol with a concentration of 20% or less corrode 304 stainless steel?
Sure, it will – hydrochloric acid causes too much corrosion
Of course, under acidic conditions, media containing high levels of chloride ions will cause severe corrosion to stainless steel. It would be good to look up the material corrosion table by yourself.
Corrosion must be severe; this requires stainless steels with high nickel and molybdenum content, such as Hastelloy, or more advanced materials like zirconium. Ordinary stainless steel won’t do – in the event of corrosion, nothing will be left behind.:)
This post was last edited by Wang Genrong on 2019-8-20 07:50. A stainless steel substrate is used, with HALAR anti-corrosion material applied on top; it offers high levels of corrosion protection and can withstand strong acids and alkalis.
This post was last edited by Wang Genrong on 2019-8-22 07:26. What device is it used for? Is it a pipeline, a heat exchanger, or a tower-type device? The media used in epichlorohydrin plants are also dichloropropanol, hydrogen chloride, hydrochloric acid, etc. The equipment employed is made of graphite, such as graphite distillation towers, graphite reboilers, graphite condensers, graphite coolers, graphite scrubbers, and so on; their typical service life is 8–10 years or even more than that.
It should refer to the pipeline section... Titanium material will work fine for that... We’ve been using it for almost 20 years now... As for the heat exchanger, pure titanium can also be used, but care must be taken regarding gap corrosion... (That’s what titanium fears the most...)
Whether titanium or titanium alloys can be used depends on conditions such as chloride ion concentration, temperature, and pH value. In fact, titanium is highly chemically reactive; it can catch fire on its own in high-temperature chlorine gas. The corrosion resistance of titanium under specific operating conditions is attributed to a protective layer on its surface; however, when the temperature rises, even dilute hydrochloric acid can corrode titanium.
Thank you for sharing the information. Since the question involves a large format… and my production process likely uses ECH as well… that’s why I’m providing these suggestions as a reference